online treasure hunt - 1

Short Circuit and Overload

Irmina C. Calibo
Zamboanga del Sur National High school
Namnama1234@yahoo.com.ph


Introduction

House on fire! Exploding appliances! What could be the cause?

Working by pair, explore the Dangers and Prevention of Short Circuit and Overload through this online treasure hunt. Read the questions carefully and open the Web resources listed below. You must read the Web resources thoroughly and with deep understanding. Publish your answers in your lecture notebook. After publishing your answers you must work together on the Big Question.

Questions
1. What is short circuit?
2. What is the common cause of unintentional short circuits in electrical devices?
3. What is the purpose of intentional short circuits?
4. When is there an overload in a circuit?
5. What is a fuse? What happens when you blow a fuse?
6. How do Circuit breakers Work?
7. Why will too many electrical devices operating at one time often blow a fuse?
8. What are the dangers of short circuit and overload?


Web Resources
· http://electronics.howstuffworks.com/circuit-breaker.html
. http://www.exploratorium.edu/snscks/short%20circuit.html
· http://en.wikipedia.org/ %28electrical%29
· http://en.wikipedia.org/wiki/Electrical_overload
. http://en.wikipedia.org/wiki/Short%20circuit
http://www.hometips.com/hps_shortcircuit03.html

The Big Question

How can Overloading and Short Circuit be prevented?

Still working by pair make a poster about overloading and short circuit.
Your poster must show the dangers and prevention of overloading and short circuit.
Your poster size is 1/4 of a cartolina to be submitted on October 9, 2009.
Please be guided by the criteria given below:

criteria/percentage

neatness 20%

creativity and color harmony 20%

application to the real world 20%

- able to apply learning

concept understanding 20%
- shows understanding of key concepts

clarity of thought 20%
- well organized


September 10, 2009